Continental HSR (Heavy-Duty Steer-Axle Regional) Commercial Highway Rib Summer tires were developed primarily for single application use on the steering axles of medium-duty vehicles. The Continental HSR can also accommodate on/off highway service (depending on conditions).The Continental HSR features a deep cut and chip resistant tread compound molded into a tread design featuring robust, continuous shoulder ribs to resist wear in high scrub applications and independent intermediate blocks for extra traction. Pyramidal stone ejectors in all tread grooves reduce stone retention for long casing life.Highway – limited to 75 mph at indicated loads unless otherwise stated